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Derivative Instruments and Hedging Activities - Commitment of Cross Currency Swaps (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2016
NOK
Derivative [Line Items]    
Fair Value / Carrying Amount of Asset / (Liability) $ (2,993)  
Cross Currency Interest Rate Contract [Member]    
Derivative [Line Items]    
Fair Value / Carrying Amount of Asset / (Liability) (237,165)  
Cross Currency Interest Rate Contract [Member] | 5.25% Margin [Member] | NIBOR [Member]    
Derivative [Line Items]    
Notional Amount $ 72,946 NOK 408,500,000
Receivable Margin 5.25% 5.25%
Fixed Rate Payable 6.88% 6.88%
Fair Value / Carrying Amount of Asset / (Liability) $ (26,417)  
Remaining Term (years) 3 months 18 days  
Cross Currency Interest Rate Contract [Member] | 5.75% Margin [Member] | NIBOR [Member]    
Derivative [Line Items]    
Notional Amount $ 70,946 NOK 420,000,000
Receivable Margin 5.75% 5.75%
Fixed Rate Payable 8.84% 8.84%
Fair Value / Carrying Amount of Asset / (Liability) $ (25,821)  
Remaining Term (years) 1 year 10 months 24 days  
Cross Currency Interest Rate Contract [Member] | 5.75% Margin [Member] | NIBOR [Member]    
Derivative [Line Items]    
Notional Amount $ 143,536 NOK 800,000,000
Receivable Margin 5.75% 5.75%
Fixed Rate Payable 7.58% 7.58%
Fair Value / Carrying Amount of Asset / (Liability) $ (56,272)  
Remaining Term (years) 2 years  
Cross Currency Interest Rate Contract [Member] | 6.00% Margin [Member] | NIBOR [Member]    
Derivative [Line Items]    
Notional Amount $ 110,400 NOK 900,000,000
Receivable Margin 6.00% 6.00%
Fixed Rate Payable 7.723% 7.723%
Fair Value / Carrying Amount of Asset / (Liability) $ (3,814)  
Remaining Term (years) 4 years 9 months 18 days  
Cross Currency Interest Rate Contract [Member] | 4.35% Margin [Member] | NIBOR [Member]    
Derivative [Line Items]    
Notional Amount $ 150,000 NOK 900,000,000
Receivable Margin 4.35% 4.35%
Fixed Rate Payable 6.43% 6.43%
Fair Value / Carrying Amount of Asset / (Liability) $ (49,655)  
Remaining Term (years) 1 year 8 months 12 days  
Cross Currency Interest Rate Contract [Member] | 4.25% Margin [Member] | NIBOR [Member]    
Derivative [Line Items]    
Notional Amount $ 162,200 NOK 1,000,000,000
Receivable Margin 4.25% 4.25%
Fixed Rate Payable 7.45% 7.45%
Fair Value / Carrying Amount of Asset / (Liability) $ (55,286)  
Remaining Term (years) 2 years 1 month 6 days  
Cross Currency Interest Rate Contract [Member] | Margin 3.70% [Member] | NIBOR [Member]    
Derivative [Line Items]    
Notional Amount $ 134,000 NOK 1,000,000,000
Receivable Margin 3.70% 3.70%
Fixed Rate Payable 5.92% 5.92%
Fair Value / Carrying Amount of Asset / (Liability) $ (19,900)  
Remaining Term (years) 3 years 4 months 24 days  
Foreign Currency Contracts [Member] | 5.75% Margin [Member]    
Derivative [Line Items]    
Notional Amount $ 1,200 NOK 7,200,000
Premium percent 3.00% 3.00%
Foreign Currency Contracts [Member] | 5.75% Margin [Member]    
Derivative [Line Items]    
Notional Amount $ 3,400 NOK 19,200,000
Premium percent 3.00% 3.00%